τὸ κεφάλαιον
From LSJ
ο φίλος τον φίλον εν πόνοις και κινδύνοις ου λείπει → a friend does not abandon his friend in difficulties and in danger, a friend in need is a friend indeed
Greek > English (Woodhouse)
capital, in fine, the chief point, the chief points, the main features, the main point, the principal point, the crowning act